After years of carrying a pistol with a manual safety I am moving to a safetiless pistol. I've been carrying the H&K USP Compact 45ACP. THe 9mm v 40 thread has me thinking the 9mm is better (I can afford ammo to train, and extra shot capacity is more a benefit to me that stopping power per shot). I'm now looking at the H&K P30. It has no manual safety and is fully ambidextrous.
A manual safety on a pistol is not needed as long as the user has proper training, proper carrying methods, and proper handling procedure.
I was in that group for a long time. After taking a class at MDFI, and drawing from concealed, disengaging the safety, and getting on target, I was a full 2 seconds behind in my shooting from someone who was open carrying. While I don't expect to be as fast off the draw as an open carrier (I have to relocate clothing to get at the pistol), the extra steps of safety disengagement put me at a further disadvantage of getting shots on target. Considering in that time a trained user can empty a magazine, it means I have to deal with 15-19 shots coming my way before I can return fire.
So, if a Glock is Right For You, get it, and don't look back. Instead, learn its proper use, get the proper training, and go to a legitimate training center that will instill the proper handling, drawing, and shooting procedures for your pistol. Once you get a couple thousand rounds downrange with it, good policy should be thoroughly imprinted in your head and your concerns with your pistol will be alleviated.